[#97] The Sweeter Side of DensityMichael Davis and Charles HenryStudents determine the density of different sugar solutions and then devise a method for layering them in a graduated cylinder. Dyeing the solutions with food coloring results in a rainbow-colored, heterogeneous mixture.Davis, Michael; Henry, Charles. J. Chem. Educ.2008, 85, 1088A.

Teaching Physical Chemistry Experiments with a Computer Simulation by LabVIEWA. Belletti, R. Borromei, and G. InglettoThis article reports on a computer simulation developed with the software LabVIEW of the physical chemistry experiment regarding the vapor pressure measurements of a pure liquid as a function of temperature, as well as a system of data collecting that emphasizes the similarities between the virtual and real experiment.Belletti, A.; Borromei, R.; Ingletto, G. J. Chem. Educ.2006, 83, 1353.

Equilibrium |

Laboratory Computing / Interfacing |

Liquids |

Thermodynamics |

Gases |

Student-Centered Learning

General Education and General Chemistry—ReduxLeslie S. ForsterThis paper discusses the desirability of including non-technical general education topics in chemistry courses intended for science and engineering students.Forster, Leslie S. J. Chem. Educ.2006, 83, 614.

Carbon Dioxide Flooding: A Classroom Case Study Derived from Surgical PracticeRobert C. KerberThe surgical opening in open-heart surgery is often flooded with carbon dioxide gas to avoid air embolisms when the heart is closed and restarted. This practice can be used in chemistry courses to illustrate concepts of gas density, solubility, and acidbase equilibria, including buffering.Kerber, Robert C. . J. Chem. Educ.2003, 80, 1437.

Gas Me Up, or, A Baking Powder DiverHenry R. Derr, Tricia Lewis, and Bretton J. DerrIn this procedure, a pipet that repeatedly submerges and rises to the surface in a tub of water is produced from a beral pipet and baking powder. The procedure works well in outreach activities with children aged 4 to 40 and beyond.Derr, Henry R.; Lewis, Tricia; Derr, Bretton J. J. Chem. Educ.2000, 77, 171.

Acids / Bases |

Gases

Henry's Law and Noisy KnucklesDoris R. KimbroughPresented here is the application of Henry's law to the noise associated with "cracking" knuckles. Gases dissolved in the synovial fluid in joints rapidly come out of solution as the joint is stretched and pressure is decreased. This "cavitation" produces a characteristic noise. Kimbrough, Doris R. J. Chem. Educ.1999, 76, 1509.

Gases |

Solutions / Solvents |

Applications of Chemistry |

Medicinal Chemistry

The Fizz Keeper, a Case Study in Chemical Education, Equilibrium, and KineticsReed HowaldThe chemistry of the loss of carbonation from carbonated beverages on storage is considered. Increasing the pressure of CO2(g) will restore carbonation, but an increase in pressure adding air should not affect the equilibria. It can and does, however, affect the kinetics-the rate at which a new equilibrium is established. Thus the Fizz Keeper is effective for storage of resealed pop containers for hours, but not for periods of weeks or months. Howald, Reed. J. Chem. Educ.1999, 76, 208.

Questions from a can of PepsiMitchell, TonyA can of Pepsi can be the starting point of countless chemistry questions that students can relate to. The author encourages other instructors to think about helping students understand chemistry as it relates to contemporary society.Mitchell, Tony J. Chem. Educ.1988, 65, 1070.

A novel classification of concentration unitsMacCarthy, PatrickConcentration units can be a source of confusion for students. This article presents a treatment on this topic that may help students understand the differences between these units.MacCarthy, Patrick J. Chem. Educ.1983, 60, 187.

Nomenclature / Units / Symbols |

Solutions / Solvents |

Aqueous Solution Chemistry

Notes from physics journalsSmith, Douglas D.Solution with an index of refraction that matches that of Pyrex glass and a reverse cartesion diver.Smith, Douglas D. J. Chem. Educ.1982, 59, 243.

Notes on determination of dissolved oxygenSommers, Raymond A.Simplifications in the referenced procedure that make it more suitable for the introductory laboratory.Sommers, Raymond A. J. Chem. Educ.1973, 50, 160.

Tire Inflation ThermodynamicsPlumb, Robert C.; Connors, John J.Explains why inflating a tire with a hand pump heats the air being pumped into the tire.Plumb, Robert C.; Connors, John J. J. Chem. Educ.1971, 48, 837.

Gases |

Thermodynamics |

Applications of Chemistry

Prolonging death (in apples)Plumb, Robert C.Using controlled atmosphere storage to prolong the freshness of vegetables and fruits after they have been harvested.Plumb, Robert C. J. Chem. Educ.1970, 47, 518.